Toggle-grinder.



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D. S. SEYMOUR.

TOGGLE GRINDER.

AERLICATION FILED DEC.5,19I6. 1,277,140. Patented Aug. 27, 1918:.

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D. S. SEYMOUR.

TOGGLE GRINDER.

APPLICATION FILED 0c.5. 19m,

1,277,140. Patented Aug. 27, 1918.

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D. S. SEYMOUR.

TOGGLE GRINDER.

APPHCATION mzo 0605.1911'.

Patented Aug. 27, 1918..

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TOGGLE GRINDER.

APPLICATION FILED ozc.5,1 91s.

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TOGGLE GRINDER.

APPLICATION FILED 050.5. l9lfi.

1,277,140. Patented Aug. 27, 1918.

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D. S. SEYMOURx TOGGLE GRINDER. APPLICATION FILED DEC. 5. 1916.1,277,140. Patented Aug. 27, 1918.

6 SHEETSSHEET 6.

ri'rnn STATES PATENT OFFICE.

DUDLEY s. SEYMOUR, or OAK PARK, ILLINoIs, 'AssIGNOR T0 UNION SPE I LMACHINE COMPANY, or CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TOGGLEGRIMDER.

Specification of Letters Patent.

Patented Aug. 27, 1918.

Applcation filed December 5, 1916. Serial No. 135,127.

Illinois, have invented certain new and useful Improvements inToggle-Grinders, of which the following is a description, referencebeing had to the accompanying drawing and to the figures of referencemarked thereon.

The invention relates to new and useful improvements in grindingmachines, and more particularly to the holder for presenting the tool orobject to be ground to the grinding wheel.

An object of the invention is to provide a grinding machine with a toolholder which may be properly manipulated for presenting either member ofa toggle trimming mechanism to the grinding wheel.

A further object of the invention is to provide a tool holder for agrinding wheel wherein the holder may be swung in a plane parallel withthe axis of the grinding wheel and also tilted or swung In a directionat right angles to said )lane.

wherein either of said members may be secured to the holder so that thepivot center of the toggle member will be in a line containing thepivotal axis of the holder.

These and other objects will in part be obvious and will in part behereinafter more fully disclosed.

In the drawings, which show by way of illustration one embodiment of theinvention:

Figure 1 is a side elevation of a machine embodying the improvements;

Fig. 2 is a plan view of the same;

Fig. 3 is a view inside elevation and with certain of the parts insection to show the means for adjusting the carriage, the means forpivotally supporting the holder, and the means for holding the toggletrimming membi-r in the holder Fig. -lis a sectional view on the line l4of Fig. 2;

- Fig. 5 is a sectional view on the line 5-5 of Fig. 3;

Fig. 6 is a view in plan showing a portion of the machine with onemember of the toggle trimming mechanism clamped in the holder and held.in engagement with the grinding wheel;

Fig. 7 is a similar view, but showing the holder swung to a difierentposition;

F ig..7" is a detail showing a portion of the holder and the lowertoggle member clamped therein.

Fig. 8 is a view, partly in section, through the holder showing thelower toggle member supported and in engagement with the grinding wheel;

Fig. 9 is a similar view, but showing the upper toggle trimmingmemberclamped in the holder and the holder positioned for grinding oneof the beveled sides of the toggle member;

I Fig. 10 is a side view showing the toggle members which the improvedholder is particularly-adapted for supporting and grinding; and 4 4 Fig.11 is a sectional view on the line 1111 of Fig. 10.

The invention is directed particuarly to a grinding machine for grindingthe'members of a toggle trimming mechanism. A toggle trimming mechanismincludes two trimming members which are each pivoted; and these toggletrimming members have rolling contact with each other so as to sever thematerial by abrasion. The'surface of the lower toggle member is in thearc of a circle struck about the center on which said member swings. Thesame is true of the upper toggle member. The severing surface of thelower toggle member is flat and comparatively wide. The severing surfaceof the upper toggle member is flat in cross section but relativelynarrow and these two severing surfaces rolling on each other crush thematerial and sever the same by abrasion. The grinding machine isarovided with a holder which is especially adapted for the grinding ofthese toggle trimming members. Said holder is pivoted so as to swing ina plane parallel with the axis of rotation of the grinding wheel. Thetoggle member is clamped to the holder so that its pivot center is inline with the pivotal axis of the holder. This holder is mounted on acarriage which may be moved toward and from the grinding wheel. Thetoggle member when clamped in the holder is thus brought into engagementwith the grinding wheel in which the holder is swung about its pivot soas to grind thesurface of the y a supporting base 1 which may be clampedto any suitable supporting member and said base has rising therefrom twosupports which are formed with suitable bearings 2 and for a shaft 4.The shaft 4 is provided with a belt wheel 5 which may be driven from anysuitable motor or other operating mecha nism. At one end of the shaft 4there is a brush wheel 6. At the other end of the shaft there is agrindingwheel which is secured to the shaft by a clamping nut 8. Ahousing 9 incloses a portion of the grinding wheel.

Theholder is indicated at 10 in the drawings. Said'holder is carried byacarriage 11 which is mounted to slide toward and from the grindingwheel. The supporting base 1 has parallel projecting arms 12 whichextend into a dovetailed groove 13 formed in the under face of thecarriage 11. These arms serveas a suitable means for supporting thecarriage whereby said carriage slides back and forth, asabove noted,toward and front the grinding wheel. The carriage is shifted by means ofan adjusting screw 13. Said screw is mounted in a lug '14 so as to turnfreely therein but is'held from endwise movement in said lug. "This lugis formed integral with the arms 12. Attached to the carriage 11 is adepending lug 15 which is threaded toreceive the screw 13. As the screw13 is turned, the carriage will be moved back and forth depending uponthe direction of rotation of the screw.

' Before describing in detail the holder for the trimming members I willdescribe a little more in detail the toggle trimming members which mydevice is particularly adapted to support and grind. The toggle trimmingmembers are shown in detail in Figs. 10 and 11 of the drawings andconsist of an upper member 16 and a lower member 17 These.

toggle trimming members are especially designed for use in a sewingmachine for severing the fabric, which is being stitched. The uppermember 16 is pivoted to swing about a center pivot at 18. The surface 20of the lower trimming member is formed on the arc of acircle struckabout the center 19.

Thesurface 21 of the upper trimming member is curved in the'arc of acircle struck about the center 18. The lower trimming member has arecessed portion 22while the upper trimmingimemberhas a depending lug 23which engages said recessed portion and this causes the trimming membersto surfaces crush the material and sever the same by abrasion. Itsometimes occurs in practice that the metal on the upper toggle memberis too hard and as a result the cutting edge will break, thusnecessitating the 'grinding of this toggle member to reconstruct thesurface. Then again, the metal may be too soft and the cutting edge willbe flattened out, which necessitates the grinding of the toggle member.It sometimes also occurs that a groove is formed in the under toggletrimming member by this relatively narrow crushing surface on the uppertoggle member and this necessitates the grinding out of this groove.

The holder for the toggle trimming members is pivotally supported on thecarriage. Said holder includes a support 24. This support is clamped toa rod 25 by means of a set screw 26. The rod 25 is journaled in bearings27 and 28 formed on the carriage 11. Pivotally mounted on the support isthe lower clamping member 29 of the holder. This clamping member has anopening 30 formed therethrough with a shoulder 31 adjacent its upperend. Extending down through the opening is a pivot post 32. This pivotpost has a threadedshank 33 which engages a threaded opening 34 in thesupport 24. A look nut 35 holds the pivot pin in place. Theupper'clamping member is indicated at 36.

A post 37 is mounted on the lower clamping member so as to freely swivelon said lower clamping member. This post rests on the shoulder 38 andthe lower end thereof is riveted at 39 to hold the post in place. Thepost is formed with a slot 40 in its end and the clamping member 36 liesin this slot and is secured to the post 37 by apivot pin 41. The upperclamping member is swung on its pivot by a clamping screw 42 which isthreaded into the outer end of the clamping member 36 and bears againsta wear plate 43 on the lower clamping member.

The pivot post 32 is hollow, that is, it is formed with an opening 44which extends entirely therethrough. A placing pin 45 is located in thisopening and extends above the upper end thereof. Said pin has an extended head 46 which is adapted to bear against a shoulder in theopening 44 to limit the upward movement of the pin. Said pin isyieldingly forced in an upward direction by a spring 47 which bearsagainst the lower end of the pin. This spring rests on a threaded cap 48which is screwed into the lower end of the post.

In Figs. 7 a and 8 of the drawings I have shown the lower toggletrimming member 17 clamped by the holder and as being presented to thegrinding wheel. The placing pin engages the opening 19 which is thepivot center for the lower toggle member. It is noted that this placingpin 45 has its center in the line of the pivot center around which theclamping members swing. The two jaws of the clamping members are separated, then the lower toggle member is placed on the lower clamping jaw,after which the upper clamping member is firmly clamped against thelower clamping member by means of the screw 42. As will ap pear fromFig. 1 of the drawings the outer end of the rod 25 is proyided with afinger 49. Fixed to the carriage 11 is a stop 50 which is adapted to beengaged by this finger 49. There is also a second stop 51 which isadjustably mounted in a post 52 mounted on the carriage. ment of thefinger 49 in the opposite direction. The rod 25 is clamped in a setposition by a locking set screw 53 which is threaded through the post 27and bears against the rod. When the finger 49 is against the stop 50then the holder is positioned as shown in Fig. 8. When in this positionthe toggle trimming member-17 lies in a horizontal plane which passessubstantially through the center of the grinding wheel and therefore thesurface ground on the toggle member will be substantially at rightangles to the plane of the toggle member. It will also be apparent thatthe surface ground will lie in an arc, the center of which is the centerof the opening 19 and this is the pivot center of the lower toggletrimming member.

In Figs. 1, 2, 3, 6, I have shown the upper toggle member as clamped bythe holder and positioned for grinding one of the beveled sides thereof.

It is noted that the aperture 19 issomewhat larger than the aperture 18.The placing pin 45 has its outer end cut down as at 45 so as to fit theaperturerlS. When the upper toggle trimming member 16 is placed on thisreduced section of the placing pin, the pin may be depressed so that thetoggle member will rise against the lower clamping member and thus clampin the same manner the above described in connection with the lowertoggle trimming member. If the holder is placed so as to swing in ahorizontal plane, passing'through the center of the grinding wheel, thenthe surface 21 of the above toggle trimming member will be ground. Inorder to grind the beveled sides and the holder swung so that the finger49 This limits the move- 7 and 9 of the drawings engages the stop 51.The carriage is moved upwardly so as to bring the trimming member intocontact with the grinding wheel and it is then positioned so as to grindone of the beveled sides of said member. When the parts are positionedas shown in Fig. 9, then the side 21 will be ground. To grind the otherbeveled side 21*, the other beveled trimming member is merely turnedover and clamped and presented to the grinding wheel. The pivot post forthe holder has a cut-away section 54 which receives the extension 16 onthe upper trimming member so as to permit the same to be clamped flatagainst the lower clamping member.

The brush wheel 6, referred to above, is impregnated with a suitablepolishing powder and is used to break the square corners left by thegrinding wheel so that the cutting edge of the upper toggle may berounded ofi. The upper toggle should not have a sharp edge as theseparating of the fabric sections through the action of the toggletrimming mechanism is brought about through the rubbing or abrading ofthe material in contradistinction to the actual cutting of it.

It is obvious that minor changes in the details of construction and thearrangement of parts may be made without departing from the spirit ofthe invention, as set forth in the appended claims. Y

Having thus fully described my invention what I claim as new and desireto secure by Letters Patent is 1. A grinding machine including incombination a grindin wheel, a holder including clamping mem ers forclamping the article to be ground, a support on which said holder ispivotally mounted so as to swing in a. plane parallel with the aXis ofthe grinding wheel, means for pivotally sup porting said holder wherebyit may be moved in a direction at right angles to the plane in which itis swung, a stop for limiting said last named swinging movement of theholder and means for securing the holder in position against said stop.

2. A grinding machine including in combination a grinding wheel, aholder including clamping 7 members for clamping the article tobeground, a support on which said holder is pivotally mounted so as toswing in a plane parallel with the axis of the grindingwheel, meansforpivotally supporting said holder whereby it may be moved in adirection at right angles to the planein which it, is swung, a stop forlimiting said last named swinging movement of the holder and means forsecuring the holder in position against said stop, said stop beingadjustable whereby the position of the article being ground may beshifted relative to the grinding wheel.

3. A grinding machine including in coming claiiipilig' 'n'ien'ibe'rs forclamping the article to be ground, a'support on which said holder ispivotally mounted so as to swing in plane parallel with theaxis of thegrind toward" and "from tlie"grindiiig wheel to bring the article intoengagement with'said 1'0 grinding wheel, said'holderbeing pivotallysupported by said; carriage, whereby the same may be moved in 'a planeat right angles to the plane in which it'isswuiigf stops for limitingthe tilting nioveineiit of the holdei'fand means ior'sec uring theiialed in said bearings, means for holding holder in an adjustedposition. at. A grinding machine: including in combination a grindingwheel, a holder having l clamping members foi-"clan'i 'iing the articleto be ground, a support on which said holder is pivoted so as to swingin a plane p'amllel' 3 with tlie'axis of thefgrinding"wheel, a carriagehaving spaced be i i iialed in the bearings oii which saidholder isclamped, at finger carried by said, rod and stops cooperating with saidfinger for limit ing the movement of the rod.

5. A grinding machineincludingin combii f clamping members for clampingthe article tobe'grouiid, a support on wliich said holder p is pivotedso as to swingiira'planepaiallel with the axis of the grinding wheel, acarriage' having spaced' bearings, a rod jour naled in the bearings on\i 'hich said holder is clanipe'di a fiiigercarri'ed by said rod, stopscooperatingwith said "finger for limiting the movement of the rod, oneof said stops being adjustable, and "means for clamping 40 the rod withthe finger against its stops.

(3. A gi-iiidinginachin'e including in con1'-" (winding wheel, a holderhaving biiiation a i clamping members for 'clamping the article to beground, a support on which-said holder ispivoted so as to swing inaplane parallel with the axis of the grinding wheel, a car I riage havingspacedbearings, a'rod jouriialed in the bearings on which SitldllOlClQI'is clamped, a "finger carried by said rod,

stops cooperating with said fingerfor limit-' ing the movement of therod, and means for moving 'said carriage toward andffrom the grindingwheel.

7. A grinding machine including in CO111' 'bl11iitl011 a grinding wheel,a holder having clamping members for clamping the article to be ground,a support on which said holder is pivoted so as to swing in a planeparallel withthe axisof the grinding wheel,a"carriage havingSpacedbearings, a rod journaled in the bearings on which said holder isclamped, a finger carried by Copies of this patent may be'obtained foriigs, a rodfjourion afgrinding wheel, a liold erhaviiig said rod, stopscooperating with said ringer for limiti'ngth'e movement of the rod, one

v j of saidsio 'srami 'zitliieadeclscrew for moviiig'wheel, acarr ageonwhi'ch sa'id'holder 1s mounted, means for moving said 'carriagefand'forth toward and from said wheel, a screw fori'n'oviiig the carriageandliolding thesame in an adjusted position, spaced bearings on thecarriage, a rod freely joursaid rod in an adjusted position, a supportclamped to said rod, and a'holder pivotally mounted on saidsupport,said; holder includiiig clamping jaws, said'pivotal support for'tlieholder being disposed so that the holder may be swung in a planeparallel with the 'axis of the grinding"wheel.

9. A grinding machineincluding in com- 'bination, a grinding wheel, aholder iiicluding clamping" members," means for pivotally supportingsaid -clamping members whereby they may be swung in a planesubstantially parallel with the axis of the grinding wheel, a placingpin having its center in alin'ement with the 'pivotal axis for saidholder and adapted to receive the pivot aperture of a toggle trimmermember clamped in said holder, whereby the edge of said trimmer may beground in an archaving its center at the pivot center of said trimmingmember. 10. A grinding machine including in com- 'bination, a grindingwheel, a holder including clamping members, means for pivotallysupporting said clamping members whereby "they may be swung in a planesubstantially parallel with the axis of the grinding wheel,

and a placing pin having its center in alineinent with the pivotal axisfor said holder and adapted to receive the pivot aperture of a toggletrimming member clamped in "said holder,- whereby theedge of saidtriniming member may be ground in an arc hav ing its center at the pivotcenter of said *t'riinming member, said placing pin being 'yieldinglymounted and having a reduced section'whereby toggle trimming membershaving different sized pivot'apertures may be separately placed thereon.

In testimony whereof, I afiix my sig1iature in the presence of twowitnesses.

DUDLEY S. SEYMOUR.

WVitnesses S. GEORGE TATE,

F, C. BUTLER.

